Concept:Data communication equipment are network hardware devices that help send, receive, and route digital data between computers.
Explanation:Such devices act as the physical bridge between a computer and the network or transmission medium.
A modem converts digital signals to analogue signals and vice versa, allowing data to travel over telephone or cable lines.
A hub forwards data packets to all connected devices, while a switch forwards them only to the intended device.
A router connects different networks and selects the best path for data packets.
Bridges, repeaters, and digital signal processors also belong to this group.
Ordinary input and output devices such as keyboards, scanners, monitors, and printers are not data communication equipment.
Therefore, to answer the multiple-choice question, check which of I, II, and III are from the group of modems, routers, hubs, bridges, switches, or similar networking hardware.
Answer:The correct option must contain only devices from this data communication equipment group. So choose the option that lists networking hardware such as a modem, hub, router, bridge, or switch, and that does not list ordinary input or output devices.